. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Fig. 4. Fig. 3. Fig. 1. SO on with the remainder of the blocks, all of which are firmly cemented to- gether; upon the ends of each of the blocks e and d, there is a tennon which fit into grooves formed in the adjoining block, so that the whole forms one solid and compact mass. Fig. 2 shows a sectional plan of one ol tlie Ijlocks forming the arch, g being a groove formed on each side cd' the block for re- ceiving the tiles, an enlarged view of which is shown at fig. 3, and the
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. Fig. 4. Fig. 3. Fig. 1. SO on with the remainder of the blocks, all of which are firmly cemented to- gether; upon the ends of each of the blocks e and d, there is a tennon which fit into grooves formed in the adjoining block, so that the whole forms one solid and compact mass. Fig. 2 shows a sectional plan of one ol tlie Ijlocks forming the arch, g being a groove formed on each side cd' the block for re- ceiving the tiles, an enlarged view of which is shown at fig. 3, and the mode of fitting together at fig. 4, which is a side view of a portion of the wall and roof, a being the end, and b the next or adjoining arch, as described in fig. 1, one-half of each tile is made with a tennon or projection, which fits into a groove formed in the other half of the tile adjoining it, as will be seen by inspection. It will be evident that a roof couotructed as above may be covered with any description of tile or covering, and when the same is to be under- drawn, the blocks as shown at fig. 2, may have anotlier groove as shown in dotted lines for the purpose of receiving the ends of the timbers to which the laths are nailed. The specification also shows a mode of constructing ornamental chimney pot, &c., upon the same principle, and lastly, in a mode of forming the clay tor the blocks, which consists of a rectangular or oblong box with moveable sides ; a frame is made to fit the exterior of the , having a certain number of wires extending or slretched across it. eich side of the Ijox having slots cut in it to receive the wires. Thus when the box has been filled and tightly rammed with clay, the same may be divided into blocks by forcing the wires attached to the external frame through the clay, the sides of the box may then be removed, and the blocks of clay taken out for drying as is well un- derstood. FIRE EXTINGUISHER. Ch.\rles Cameron, of Liverpool,
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